Another of the brand new features within dungeons is a feature where you will randomly go into another dungeon when you access stairs. This only occurs after the completion of the game and will send you to another area. This change will last for a few floors and when you return to previous dungeon, you will be at the floor equivilant to how many floors you missed. So if you left the dungeon on 3F and were gone for 5 floors, you'd return at 9F. However, the areas vary based on several circumstances including the dungeon you were in as well as the Mystery Level of the dungeon. The higher the level, the better the possibility

Random Chambers

The more common of the areas you go to are the mapless dungeons. These dungeons have their own special differences that can manipulate your gameplay somewhat. The possibilities are as follows

Reversed Conditions - In this type of dungeon, you have the same name and locale of the Dungeons, but all the conditions are reversed. If you could befriend Pokémon within it, then you can't anymore, or vice-versa.

Past Dungeons - These dungeons are many of the storyline dungeons that you can't usually return to. Entering here allows you to find and befriend the Pokémon that are in the dungeon

Mapless Street

The next type of areas you go to are the Mapless Street dungeons. These dungeons lack any kind of floor count and contain a variety of items and Pokémon at random. These are typically determined based upon the Pokémon from the dungeon you entered. However, there is some variation upon that. The Mapless Street is the only way you can receive the other starter Pokémon; Snivy, Tepig, Oshawott, Axew and Pikachu without the use of DLC dungeons. They will appear as follows

If you enter Mapless Street via the dungeons Quiet Tundra or Dream Island, you will be able to find Pikachu's evolution line or Oshawott's evolution line

If you enter Mapless Street via the dungeons Moonlight Forest or Iron Rust Mountain, you will be able to find Snivy's evolution line

If you enter Mapless Street via the dungeons Large Pit or Smokey Mountain, you will be able to find Tepig's evolution line or Axew's evolution line

Golden Chamber

The second type of mapless dungeon is the Golden Chamber. This chamber is rare to enter, more likely the higher the Mystery Level. Unlike Mapless Street, it contains random Pokémon and it has rarer items within. There is an extra twist with the Golden Chamber though, it can hold Legendary Pokémon

If you enter the Golden Chamber while in the Quiet Tundra, Dream Island or Moonlight Forest dungeon, you have a chance of finding Tornadus while if you enter through the Iron Rust Mountain, Large Pit or Smokey Mountain dungeon, you may be able to find Thundurus. These Pokémon aren't guaranteed to join you but can be revisited each time you enter the Golden Chamber from these dungeons.